ZyXEL VES1724-56B2 User Guide - Page 102

Chapter 9 VDSL Setup Secondly, you need to create several VDSL templates and configure their VDSL line profiles and channel profiles in the VDSL Setup > VDSL Profile screen. Examples are shown next. Table 29 VDSL Template Examples VDSL TEMPLATE Template-A Template-B Template-C Template-D VDSL LINE PROFILE LineProfile-2 LineProfile-1 LineProfile-2 LineProfile-3 VDSL CHANNEL PROFILE ChanProfile-1 ChanProfile-3 ChanProfile-2 ChanProfile-1 Then you can assign VDSL templates to VDSL ports in the VDSL Setup > VDSL Line Setup screen (see Section 9.2 on page 103). Table 30 VDSL Template Examples PORT 1 2 3 4 PRIMARY TEMPLATE Template-A Template-C Template-E Template-G FALLBACK TEMPLATE Template-B Template-D Template-F Template-H 9.1.2 Primary and Fallback VDSL Templates Example On this Switch, you can specify a primary and a fallback VDSL template for each subscriber port. A subscriber port uses the parameters defined in the primary VDSL template when the line is initialized. When the actual line condition is too poor to use the primary template (for example, the defined minimum transmission rate cannot be reached), the Switch then uses the fallback template instead. You should select a looser fallback template for a line. See an example as shown next. Table 31 Primary and Fallback VDSL Template Settings Example MIN RATE TARGET SNR MARGIN US0 MASK PRIMARY TEMPLATE (P) DS: 10 Mbps, US: 2 Mbps 6 dB EU32 FALLBACK TEMPLATE (F) DS: 9 Mbps, US: 1.5 Mbps 5 dB EU128 The template F differs from templates P as follows. • A lower transmission rate is allowed. • Has higher tolerance against noise. • Uses a wider band for US0 mask. • Using F can get higher bandwidth for upstream traffic when the line has poor quality or in a long distance. 102 VES1724-56 User's Guide